Electronic hydraulic brake device

ABSTRACT

An electronic hydraulic brake device includes a main braking part and an assist braking part. The main braking part is configured to drive a motor to provide hydraulic pressure to a plurality of wheel cylinders. The assist braking part is connected to the main braking part. The assist braking part is configured to provide auxiliary hydraulic pressure to the plurality of wheel cylinders in response to an operation error of the main braking part.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2019-0045335, filed Apr. 18, 2019, which is herebyincorporated by reference for all purposes as if fully set forth herein.

BACKGROUND

FIELD

Exemplary embodiments generally relate to electronic hydraulic brakedevices, and, more particularly, to electronic hydraulic brake devices,which can rapidly perform assist braking when a main braking erroroccurs in an integrated or separated-type braking system.

DISCUSSION

In general, an electronic hydraulic brake device serves to adjustbraking pressure of each wheel using hydraulic pressure of a mastercylinder, which is driven by a motor after a driver's pedal pressure issensed through a sensor. The electronic hydraulic brake device typicallyincludes a sensor for sensing a stroke of the pedal such that a drivercan recognize desired braking pressure. The electronic hydraulic brakedevice may also include a pedal travel simulator, which enables thedriver to feel the same pedal pressure as in a conventional hydraulicbrake device. Therefore, when the driver steps on the brake pedal, anelectronic control unit senses the stepping operation and supplieshydraulic pressure to the master cylinder. The master cylinder transfersbraking hydraulic pressure to a wheel cylinder of each wheel to providea braking force to the wheel. A conventional electronic hydraulic brakedevice may not rapidly provide braking hydraulic pressure to the wheelcylinder when the motor is damaged, and thus, can cause an accident.Therefore, there is a need for a device capable of solving this issue.

A conventional electro-hydraulic brake system is disclosed in KoreanPatent Application No. 10-2007-0104982, laid-open on Oct. 30, 2007, andentitled “Control Apparatus for Valve in Electro-Hydraulic BrakeSystem.”

The above information disclosed in this section is only forunderstanding the background of the inventive concepts, and, therefore,may contain information that does not form prior art.

SUMMARY

Some aspects provide an electronic hydraulic brake device capable ofperforming (e.g., rapidly performing) assist braking in response to amain braking error in an integrated or separated-type braking system.

Additional aspects will be set forth in the detailed description whichfollows, and, in part, will be apparent from the disclosure, or may belearned by practice of the inventive concepts.

According to some aspects, an electronic hydraulic brake device includesa main braking part and an assist braking part. The main braking part isconfigured to drive a motor to provide hydraulic pressure to a pluralityof wheel cylinders. The assist braking part is connected to the mainbraking part. The assist braking part is configured to provide auxiliaryhydraulic pressure to the plurality of wheel cylinders in response to anoperation error of the main braking part.

In some exemplary embodiments, the main braking part may include a pedalcylinder, a master cylinder, a first hydraulic part, a second hydraulicpart, and a hydraulic connector. The pedal cylinder may be configured togenerate hydraulic pressure in response to pressurization of a pedal.The master cylinder may be configured to sense operation of the pedaland generate hydraulic pressure in association with the motor. The firsthydraulic part may be connected to the master cylinder. The firsthydraulic part may be configured to guide hydraulic pressure to a firstsome of the plurality of wheel cylinders. The second hydraulic part maybe connected to the master cylinder. The second hydraulic part may beconfigured to guide hydraulic pressure to a second some of the pluralityof wheel cylinders. The hydraulic connector may be configured toselectively connect the first and second hydraulic parts.

In an exemplary embodiment, the assist braking part may include anassist hydraulic part, an assist accumulator, an assist bypass part, andan assist sensing part. The assist hydraulic part may be connected toone of the first and second hydraulic parts. The assist hydraulic partmay be configured to guide hydraulic pressure. The assist accumulatormay be connected to the assist hydraulic part and may be filled with theauxiliary hydraulic pressure. The assist bypass part may be configuredto bypass the assist hydraulic part to selectively guide hydraulicpressure to the assist accumulator. The assist sensing part may beconfigured to determine the auxiliary hydraulic pressure of the assistaccumulator.

In an exemplary embodiment, the assist accumulator may be configured toselectively receive the hydraulic pressure generated by the mastercylinder so as to accumulate the auxiliary braking hydraulic pressure.

In an exemplary embodiment, the assist hydraulic part may include anassist hydraulic line and an assist hydraulic valve. The assisthydraulic line may include a first end connected to one of the first andsecond hydraulic parts and a second end connected to the assistaccumulator. The assist hydraulic valve may be configured to open theassist hydraulic line in response to an operation error of the mainbraking part.

In an exemplary embodiment, the assist bypass part may include an assistbypass line and an assist bypass valve. The assist bypass line mayinclude ends connected to the assist hydraulic line. The assist bypassline may be configured to cause, at least part, hydraulic pressure tobypass the assist hydraulic valve and to move to the assist accumulator.The assist bypass valve may be configured to cause, at least in part,one direction of flow of the auxiliary hydraulic pressure in the assistbypass line.

In an exemplary embodiment, the electronic hydraulic brake device mayfurther include a storage part connected to the pedal cylinder andconfigured to store hydraulic pressure. To this end, the assist brakingpart may further include an assist pump connected to the storage part.The assist pump may be configured to transfer the hydraulic pressurestored in the storage part to the assist accumulator.

In an exemplary embodiment, the assist braking part may include a firstassist hydraulic part, a second assist hydraulic part, an assistaccumulator, a first assist bypass part, a second assist bypass part,and an assist sensing part. The first assist hydraulic part may beconnected to the first hydraulic part. The first assist hydraulic partmay be configured to guide hydraulic pressure. The second assisthydraulic part may be connected to the second hydraulic part. The secondassist hydraulic part may be configured to guide hydraulic pressure. Theassist accumulator may be connected to the first and second assisthydraulic parts and may be filled with the auxiliary hydraulic pressure.The first assist bypass part may be configured to bypass the firstassist hydraulic part to guide hydraulic pressure to the assistaccumulator. The second assist bypass part may be configured to bypassthe second assist hydraulic part to guide hydraulic pressure to theassist accumulator. The assist sensing part may be configured todetermine the auxiliary hydraulic pressure of the assist accumulator.

In an exemplary embodiment, the main braking part may include a mastercylinder, a first hydraulic part, a second hydraulic part, and a mainmotor pump. The master cylinder may be configured to generate hydraulicpressure in association with the motor. The first hydraulic part may beconnected to the master cylinder. The first hydraulic part may beconfigured to guide hydraulic pressure to a first some of the pluralityof wheel cylinders. The second hydraulic part may be connected to themaster cylinder. The second hydraulic part may be configured to guidehydraulic pressure to a second some of the plurality of wheel cylinders.The main motor pump may be connected to the first and second hydraulicparts. The main motor pump may be configured to amplify hydraulicpressure.

In an exemplary embodiment, the assist braking part may include anassist hydraulic part, an assist accumulator, an assist bypass part, andan assist sensing part. The assist hydraulic part may be connected tothe first and second hydraulic parts. The assist hydraulic part may beconfigured to guide hydraulic pressure. The assist accumulator may beconnected to the assist hydraulic part and may be filled with theauxiliary hydraulic pressure. The assist bypass part may be configuredto bypass the assist hydraulic part to guide hydraulic pressure to theassist accumulator. The assist sensing part may be configured todetermine the auxiliary hydraulic pressure of the assist accumulator.

In an exemplary embodiment, the assist accumulator may be configured toreceive the hydraulic pressure generated by the master cylinder so as toaccumulate the auxiliary braking hydraulic pressure.

In an exemplary embodiment, the assist hydraulic part may include anassist hydraulic line and an assist hydraulic valve. The assisthydraulic line may include a first end connected to the first and secondhydraulic parts and a second end connected to the assist accumulator.The assist hydraulic valve may be configured to open the assisthydraulic line in response to an operation error of the main brakingpart.

In an exemplary embodiment, the assist bypass part may include an assistbypass line and an assist bypass valve. The assist bypass line mayinclude ends connected to the assist hydraulic line. The assist bypassline may be configured to cause, at least in part, hydraulic pressure tobypass the assist hydraulic valve and to move to the assist accumulator.The assist bypass valve may be configured to cause, at least in part,one direction of flow of the auxiliary hydraulic pressure in the assistbypass line.

In an exemplary embodiment, the electronic hydraulic brake device mayfurther include a storage part connected to the pedal cylinder andconfigured to store hydraulic pressure. To this end, the assist brakingpart may further include an assist pump connected to the storage part.The assist pump may be configured to transfer the hydraulic pressurestored in the storage part to the assist accumulator.

In an exemplary embodiment, the assist braking part may include a firstassist hydraulic part, a second assist hydraulic part, an assistaccumulator, a first assist bypass part, a second assist bypass part,and an assist sensing part. The first assist hydraulic part may beconnected to the first hydraulic part. The first assist hydraulic partmay be configured to guide hydraulic pressure. The second assisthydraulic part may be connected to the second hydraulic part. The secondassist hydraulic part may be configured to guide hydraulic pressure. Theassist accumulator may be connected to the first and second assisthydraulic parts and may be filled with the auxiliary hydraulic pressure.The first assist bypass part may be configured to bypass the firstassist hydraulic part to guide hydraulic pressure to the assistaccumulator. The second assist bypass part may be configured to bypassthe second assist hydraulic part to guide hydraulic pressure to theassist accumulator. The assist sensing part may be configured todetermine the auxiliary hydraulic pressure of the assist accumulator.

In some aspects of an electronic hydraulic brake device, a main brakingpart and an assist braking part can be connected as a hydraulic pressurecircuit to move hydraulic pressure, and auxiliary hydraulic pressurestored in an assist braking part can be moved to the main braking partand supplied to wheel cylinders in response to an operation error of themain braking part. Furthermore, in some aspects of an electronichydraulic brake device, an assist pump can forcibly move braking fluidstored in a storage part to an assist accumulator. As such, in responseto an operation error of the main braking part, auxiliary hydraulicpressure can be continuously supplied to the assist accumulator toperform vehicle braking.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the inventive concepts, and are incorporated in andconstitute a part of this specification, illustrate exemplaryembodiments of the inventive concepts, and, together with thedescription, serve to explain principles of the inventive concepts.

FIG. 1 is a diagram schematically illustrating an electronic hydraulicbrake device according to an exemplary embodiment.

FIG. 2 is a diagram schematically illustrating a main braking partaccording to an exemplary embodiment.

FIG. 3 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 2 according to an exemplaryembodiment.

FIG. 4 is a diagram schematically illustrating a hydraulic pressure flowthrough the electronic hydraulic brake device of FIG. 3 , and in whichan assist accumulator is filled with high braking hydraulic pressureaccording to an exemplary embodiment.

FIG. 5 is a diagram schematically illustrating a hydraulic pressure flowthrough the electronic hydraulic brake device of FIG. 3 , and in whichthe high braking hydraulic pressure stored in the assist accumulator issupplied to one or more wheel cylinders according to an exemplaryembodiment.

FIG. 6 is a diagram schematically illustrating an assist pump added tothe assist braking part of FIG. 2 according to an exemplary embodiment.

FIG. 7 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 2 according to an exemplaryembodiment.

FIG. 8 is a diagram schematically illustrating a main braking partaccording to an exemplary embodiment.

FIG. 9 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 8 according to an exemplaryembodiment.

FIG. 10 is a diagram schematically illustrating a hydraulic pressureflow through the electronic hydraulic brake device of FIG. 9 , and inwhich an assist accumulator is filled with high braking hydraulicpressure according to an exemplary embodiment.

FIG. 11 is a diagram schematically illustrating a hydraulic pressureflow through the electronic hydraulic brake device of FIG. 9 , and inwhich high braking hydraulic pressure stored in an assist accumulator issupplied to one or more wheel cylinders according to an exemplaryembodiment.

FIG. 12 is a diagram schematically illustrating an assist pump added tothe assist braking part of FIG. 9 according to an exemplary embodiment.

FIG. 13 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 8 according to an exemplaryembodiment.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

In the following description, for the purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of various exemplary embodiments. As used herein, theterms “embodiments” and “implementations” are used interchangeably andare non-limiting examples employing one or more of the inventiveconcepts disclosed herein. It is apparent, however, that variousexemplary embodiments may be practiced without these specific details orwith one or more equivalent arrangements. In other instances, well-knownstructures and devices are shown in block diagram form in order to avoidunnecessarily obscuring various exemplary embodiments. Further, variousexemplary embodiments may be different, but do not have to be exclusive.For example, specific shapes, configurations, and characteristics of anexemplary embodiment may be used or implemented in another exemplaryembodiment without departing from the inventive concepts.

Unless otherwise specified, the illustrated exemplary embodiments are tobe understood as providing exemplary features of varying detail of someexemplary embodiments. Therefore, unless otherwise specified, thefeatures, components, modules, layers, films, panels, regions, aspects,etc. (hereinafter individually or collectively referred to as an“element” or “elements”), of the various illustrations may be otherwisecombined, separated, interchanged, and/or rearranged without departingfrom the inventive concepts.

The use of cross-hatching and/or shading in the accompanying drawings isgenerally provided to clarify boundaries between adjacent elements. Assuch, neither the presence nor the absence of cross-hatching or shadingconveys or indicates any preference or requirement for particularmaterials, material properties, dimensions, proportions, commonalitiesbetween illustrated elements, and/or any other characteristic,attribute, property, etc., of the elements, unless specified. Further,in the accompanying drawings, the size and relative sizes of elementsmay be exaggerated for clarity and/or descriptive purposes. As such, thesizes and relative sizes of the respective elements are not necessarilylimited to the sizes and relative sizes shown in the drawings. When anexemplary embodiment may be implemented differently, a specific processorder may be performed differently from the described order. Forexample, two consecutively described processes may be performedsubstantially at the same time or performed in an order opposite to thedescribed order. Also, like reference numerals denote like elements.

When an element is referred to as being “on,” “connected to,” or“coupled to” another element, it may be directly on, connected to, orcoupled to the other element or intervening elements may be present.When, however, an element is referred to as being “directly on,”“directly connected to,” or “directly coupled to” another element, thereare no intervening elements present. Other terms and/or phrases used todescribe a relationship between elements should be interpreted in a likefashion, e.g., “between” versus “directly between,” “adjacent” versus“directly adjacent,” “on” versus “directly on,” etc. Further, the term“connected” may refer to physical, electrical, and/or fluid connection.For the purposes of this disclosure, “at least one of X, Y, and Z” and“at least one selected from the group consisting of X, Y, and Z” may beconstrued as X only, Y only, Z only, or any combination of two or moreof X, Y, and Z, such as, for instance, XYZ, XYY, YZ, and ZZ. As usedherein, the term “and/or” includes any and all combinations of one ormore of the associated listed items.

Although the terms “first,” “second,” etc. may be used herein todescribe various elements, these elements should not be limited by theseterms. These terms are used to distinguish one element from anotherelement. Thus, a first element discussed below could be termed a secondelement without departing from the teachings of the disclosure.

Spatially relative terms, such as “beneath,” “below,” “under,” “lower,”“above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), andthe like, may be used herein for descriptive purposes, and, thereby, todescribe one element's relationship to another element(s) as illustratedin the drawings. Spatially relative terms are intended to encompassdifferent orientations of an apparatus in use, operation, and/ormanufacture in addition to the orientation depicted in the drawings. Forexample, if the apparatus in the drawings is turned over, elementsdescribed as “below” or “beneath” other elements or features would thenbe oriented “above” the other elements or features. Thus, the exemplaryterm “below” can encompass both an orientation of above and below.Furthermore, the apparatus may be otherwise oriented (e.g., rotated 90degrees or at other orientations), and, as such, the spatially relativedescriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting. As used herein, thesingular forms, “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. Moreover,the terms “comprises,” “comprising,” “includes,” and/or “including,”when used in this specification, specify the presence of statedfeatures, integers, steps, operations, elements, components, and/orgroups thereof, but do not preclude the presence or addition of one ormore other features, integers, steps, operations, elements, components,and/or groups thereof. It is also noted that, as used herein, the terms“substantially,” “about,” and other similar terms, are used as terms ofapproximation and not as terms of degree, and, as such, are utilized toaccount for inherent deviations in measured, calculated, and/or providedvalues that would be recognized by one of ordinary skill in the art.

Various exemplary embodiments are described herein with reference tosectional views, isometric views, perspective views, plan views, and/orexploded illustrations that are schematic illustrations of idealizedexemplary embodiments and/or intermediate structures. As such,variations from the shapes of the illustrations as a result of, forexample, manufacturing techniques and/or tolerances, are to be expected.Thus, exemplary embodiments disclosed herein should not be construed aslimited to the particular illustrated shapes of regions, but are toinclude deviations in shapes that result from, for instance,manufacturing. To this end, regions illustrated in the drawings may beschematic in nature and shapes of these regions may not reflect theactual shapes of regions of a device, and, as such, are not intended tobe limiting.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure is a part. Terms,such as those defined in commonly used dictionaries, should beinterpreted as having a meaning that is consistent with their meaning inthe context of the relevant art and will not be interpreted in anidealized or overly formal sense, unless expressly so defined herein.

Hereinafter, various exemplary embodiments of an electronic hydraulicbrake device will be described with reference to the accompanyingdrawings.

FIG. 1 is a diagram schematically illustrating an electronic hydraulicbrake device according to an exemplary embodiment.

Referring to FIG. 1 , the electronic hydraulic brake device according toan exemplary embodiment includes a main braking part 1 and an assistbraking part 2.

The main braking part 1 drives a motor to provide braking hydraulicpressure to a plurality of wheel cylinders, such as wheel cylinder 3.Hereinafter, wheel cylinder 3 will be referred to as the plurality ofwheel cylinders 3. The assist braking part 2 is connected to the mainbraking part 1 and filled with high (or auxiliary) braking hydraulicpressure. The assist braking part 2 provides braking hydraulic pressureto the plurality of wheel cylinders 3 in response to an operation errorof the main braking part 1.

According to some exemplary embodiments, the electronic hydraulic brakedevice may divide an electronic braking device of an electric vehicle,hybrid vehicle, or autonomous vehicle into at least two parts, e.g., themain braking part 1 and the assist braking part 2. When an operationerror of the main braking part 1 occurs, the high braking hydraulicpressure stored in the assist braking part 2 may be rapidly supplied tothe wheel cylinders 3 to perform emergency braking. The operation errorof the main braking part 1 may indicate that the motor cannot be drivenor may indicate operation error(s) of one or more valves for controllinga hydraulic circuit.

FIG. 2 is a diagram schematically illustrating a main braking partaccording to an exemplary embodiment.

Referring to FIG. 2 , the main braking part 1 according to an exemplaryembodiment includes a pedal cylinder 110, a master cylinder 120, a firsthydraulic part 130, a second hydraulic part 140, and a hydraulicconnector 150.

The pedal cylinder 110 generates hydraulic pressure throughpressurization of a pedal 119. Such a pedal cylinder 110 may form twochambers, and provide a stepping force to cope with the pressurizationof the pedal 119.

The master cylinder 120 senses whether the pedal 119 is operated, andgenerates hydraulic pressure through an operation of a motor 129. Themaster cylinder 120 may form (or include) one or more chambers. Themotor 129 may be driven in a forward or backward direction according tothe pressurization state of the pedal 119. The master cylinder 120 maybe connected to the pedal cylinder 110 through a cylinder line 128.

The first hydraulic part 130 is connected to the master cylinder 120,and guides braking pressure to some of the plurality of wheel cylinders3. For example, the first hydraulic part 130 may guide hydraulicpressure to first wheel cylinders 4 mounted on any one of two frontwheels and any one of two rear wheels, respectively.

For instance, the first hydraulic part 130 may include a first-firsthydraulic line 131 connected to the master cylinder 120 to guide brakingpressure, and a first-second hydraulic line 132 connected to thefirst-first hydraulic line 131 and diverging from the first-firsthydraulic line 131 to guide braking pressure to the first wheelcylinders 4.

The second hydraulic part 140 is connected to the master cylinder 120,and guides braking pressure to others of the plurality of wheelcylinders 3. For example, the second hydraulic part 140 may guidehydraulic pressure to second wheel cylinders 5 mounted on the other oneof the two front wheels and the other one of the two rear wheels,respectively.

For instance, the second hydraulic part 140 may include a second-firsthydraulic line 141 connected to the master cylinder 120 to guide brakingpressure, and a second-second hydraulic line 142 connected to thesecond-first hydraulic line 141 and diverging from the second-firsthydraulic line 141 to guide braking pressure to the second wheelcylinders 5.

The hydraulic connector 150 connects (e.g., fluidly connects) the firstand second hydraulic parts 130 and 140 or removes the connection, e.g.,prevents hydraulic flow between the first and second hydraulic parts 130and 150. For example, the hydraulic connector 150 may connect thefirst-second hydraulic line 132 and the second-second hydraulic line142.

FIG. 3 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 2 according to an exemplaryembodiment. FIG. 4 is a diagram schematically illustrating a hydraulicpressure flow through the electronic hydraulic brake device of FIG. 3 ,and in which an assist accumulator is filled with high braking hydraulicpressure according to an exemplary embodiment. FIG. 5 is a diagramschematically illustrating a hydraulic pressure flow through theelectronic hydraulic brake device of FIG. 3 , and in which the highbraking hydraulic pressure stored in the assist accumulator is suppliedto one or more wheel cylinders according to an exemplary embodiment.

Referring to FIG. 3 , the assist braking part 2 includes an assisthydraulic part 10, an assist accumulator 20, an assist bypass part 30,and an assist sensing part 40. In one operational state, the hydraulicconnector 150 may allow movement of braking hydraulic pressure betweenthe first and second hydraulic parts 130 and 140.

The assist hydraulic part 10 is connected to any one of the first andsecond hydraulic parts 130 and 140 to guide braking hydraulic pressure.For example, the assist hydraulic part 10 may be connected to thefirst-second hydraulic line 132 or the second-second hydraulic line 142.As an example, FIG. 3 illustrates the assist hydraulic part 10 connectedto the first-second hydraulic line 132.

The assist accumulator 20 may be connected to the assist hydraulic part10 and may be filled with high braking hydraulic pressure.

The assist bypass part 30 bypasses the assist hydraulic part 10 to guidebraking hydraulic pressure to the assist accumulator 20. For example,the assist accumulator 20 may be filled with the braking hydraulicpressure through the assist bypass part 30. The braking hydraulicpressure of the assist accumulator 20 may be moved to the first orsecond hydraulic part 130 or 140 through the assist hydraulic part 10.

The assist sensing part 40 measures the braking hydraulic pressure ofthe assist accumulator 20. For example, the assist sensing part 40 maybe formed in (or otherwise in communication with) the assist hydraulicpart 10 or the assist accumulator 20 to measure the braking hydraulicpressure.

In an operational state, the motor 129 may be driven to fill the assistaccumulator 20 with high braking hydraulic pressure at an initial stage.For instance, braking hydraulic pressure generated by the mastercylinder 120 can be moved to the assist accumulator 20. At this time,the movement of the braking hydraulic pressure to the cylinder line 128is restrained, and the movement of the braking hydraulic pressure to thefirst and second wheel cylinders 4 and 5 is also restrained (see FIG. 4).

When an operation error of the main braking part 1 occurs in a state inwhich vehicle braking is required, the high braking hydraulic pressurestored in the assist accumulator 20 is moved to the first-secondhydraulic line 132 and/or the second-second hydraulic line 142, and thenmoved to the first wheel cylinders 4 and the second wheel cylinders 5.At this time, the movement of the braking hydraulic pressure to thefirst-first hydraulic line 131 and the second-first hydraulic line 141is restrained (see FIG. 5 ).

When the first-first hydraulic line 131 and the second-first hydraulicline 141 are opened with the vehicle braked by the assist braking part2, the braking hydraulic pressure of the wheel cylinders 3 may berelieved. When the braking hydraulic pressure is to be rapidly relievedas in vehicle posture control, the braking hydraulic pressure applied tothe wheel cylinders 3 may be adjusted through valve control of thefirst-second hydraulic line 132 and the second-second hydraulic line142.

The assist hydraulic part 10 includes an assist hydraulic line 11 and anassist hydraulic valve 12. The assist hydraulic line 11 has one endconnected to any one of the first and second hydraulic parts 130 and 140and the other end connected to the assist accumulator 20 via the assisthydraulic valve 12. For example, the assist hydraulic line 11 may haveone end connected to the first-second hydraulic line 132 or thesecond-second hydraulic line 142. As shown in FIG. 3 , the assisthydraulic line 11 is connected to the first-second hydraulic line 132.The assist hydraulic valve 12 is formed on (or connected to) the assisthydraulic line 11, and opens the assist hydraulic line 11 when anoperation error of the main braking part 1 occurs.

The assist bypass part 30 includes an assist bypass line 31 and anassist bypass valve 32. The assist bypass line 31 has both endsconnected to the assist hydraulic line 11, and induces braking hydraulicpressure to move to the assist accumulator 20 by bypassing the assisthydraulic valve 12. The assist bypass valve 32 is formed on the assistbypass line 31 and allows braking hydraulic pressure to move in onedirection. For example, when the assist accumulator 20 is to be filledwith braking hydraulic pressure, the assist hydraulic valve 12 may closethe assist hydraulic line 11 so that the braking hydraulic pressure canmove through the assist bypass line 31 to the assist accumulator 20. Acheck valve capable of allowing braking fluid to move in one directionmay be used as the assist bypass valve 32.

FIG. 6 is a diagram schematically illustrating an assist pump added tothe assist braking part of FIG. 2 according to an exemplary embodiment.

Referring to FIG. 6 , the assist braking part 2 according to anexemplary embodiment may further include an assist pump 50. The assistpump 50 is connected to a storage part 118, which can be connected tothe pedal cylinder 110 to temporarily store braking hydraulic pressure,and forcibly transfer the braking hydraulic pressure stored in thestorage part 118 to the assist accumulator 20. Since the brakinghydraulic pressure can be continuously supplied to the assistaccumulator 20 through the assist pump 50, vehicle braking can becontinuously performed even when an operation error of the main brakingpart 1, such as a fault of the motor 129, occurs.

FIG. 7 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 2 according to an exemplaryembodiment.

Referring to FIG. 7 , the assist braking part 2 according to anexemplary embodiment includes a first assist hydraulic part 61, a secondassist hydraulic part 62, an assist accumulator 70, a first assistbypass part 81, a second assist bypass part 82, and an assist sensingpart 90. In an operational state, the hydraulic connector 150 restrainsthe movement of braking hydraulic pressure between the first hydraulicpart 130 and the second hydraulic part 140, and maintains the state inwhich the first and second hydraulic parts 130 and 140 are divided withrespect to hydraulic fluid flow.

The first assist hydraulic part 61 is connected to the first hydraulicpart 130 to guide braking hydraulic pressure, and the second assisthydraulic part 62 is connected to the second hydraulic part 140 to guidebraking hydraulic pressure. For example, the first assist hydraulic part61 may connect the first-second hydraulic line 132 to the assistaccumulator 70, and the second assist hydraulic part 62 may connect thesecond-second hydraulic line 142 to the assist accumulator 70 or thefirst assist hydraulic part 61.

The assist accumulator 70 can be connected to the first and secondassist hydraulic parts 61 and 62 and filled with high braking hydraulicpressure.

The first assist bypass part 81 bypasses a first assist hydraulic valveof the first assist hydraulic part 61 to guide braking hydraulicpressure to the assist accumulator 70, and the second assist bypass part82 bypasses a second assist hydraulic valve of the second assisthydraulic part 62 to guide braking hydraulic pressure to the assistaccumulator 70. For example, the assist accumulator 70 may be filledwith braking hydraulic pressure through at least one of the first andsecond assist bypass parts 81 and 82, and the braking hydraulic pressureof the assist accumulator 70 may be moved to each of the first andsecond assist bypass parts 81 and 82.

The assist sensing part 90 measures the braking hydraulic pressure ofthe assist accumulator 70. For example, the assist sensing part 90 maybe formed in (or otherwise in communication with) the first and secondassist hydraulic parts 61 and 62 and/or the assist accumulator 70 tomeasure the braking hydraulic pressure.

In an operational state, the motor 129 may be driven to fill the assistaccumulator 70 with high braking hydraulic pressure at an initial stage.Then, the braking hydraulic pressure generated by the master cylinder120 can be moved to the assist accumulator 70. At this time, themovement of the braking hydraulic pressure to the cylinder line 128 isrestrained, and the movement of the braking hydraulic pressure to thefirst and second wheel cylinders 4 and 5 is also restrained.

When an operation error of the main braking part 1 occurs in a state inwhich vehicle braking is required, the high braking hydraulic pressurestored in the assist accumulator 70 is moved to the first-secondhydraulic line 132 and the second-second hydraulic line 142 via thefirst and second hydraulic assist parts 61 and 62, respectively, andthen moved to the first wheel cylinders 4 and the second wheel cylinders5. At this time, the movement of braking hydraulic pressure to thefirst-first hydraulic line 131 and the second-first hydraulic line 141is restrained.

When the first-first hydraulic line 131 and the second-first hydraulicline 141 are opened with the vehicle braked by the assist braking part2, the braking hydraulic pressure of the wheel cylinders 3 may berelieved. When the braking hydraulic pressure is to be rapidly relievedas in vehicle posture control, braking hydraulic pressure applied to thewheel cylinders 3 may be adjusted through valve control of thefirst-second hydraulic line 132 and the second-second hydraulic line142.

More detailed structures of the first and second assist hydraulic parts61 and 62 may correspond to that of the assist hydraulic part 10 of FIG.3 , and more detailed structures of the first and second assist bypassparts 81 and 82 may correspond to that of the assist bypass part 30 ofFIG. 3 . It is also contemplated that the assist pump 50 of FIG. 6 maybe applied to the assist accumulator 70 of FIG. 7 .

FIG. 8 is a diagram schematically illustrating a main braking partaccording to an exemplary embodiment.

Referring to FIG. 8 , a main braking part 1 according to an exemplaryembodiment includes a main motor pump 210, a master cylinder 220, afirst hydraulic part 230, and a second hydraulic part 240.

The master cylinder 220 generates hydraulic pressure through anoperation of a motor 229. The master cylinder 220 may form two chambers,and the motor 229 may be driven in a forward or backward directionaccording to a pressurization state of a pedal. In some exemplaryembodiments, the pedal may be in communication with the master cylinder220 to cause operation of the motor 229 to facilitate hydraulic fluidflow. In some exemplary embodiments, the pedal may be in communicationwith the motor 229 to cause operation of the master cylinder 220.

The first hydraulic part 230 is connected to the master cylinder 220,and guides braking pressure to some of the plurality of wheel cylinders3. For example, the first hydraulic part 230 may guide hydraulicpressure to the first wheel cylinders 4 mounted on any one of two frontwheels and any one of two rear wheels, respectively.

The second hydraulic part 240 is connected to the master cylinder 220,and guides braking pressure to the others of the plurality of wheelcylinders 3. For example, the second hydraulic part 240 may guidehydraulic pressure to the second wheel cylinders 5 mounted on the otherone of the two front wheels and the other one of the two rear wheels,respectively.

The main motor pump 210 is connected to the first and second hydraulicparts 230 and 240 to amplify braking hydraulic pressure.

The first hydraulic part 230 may include a first-first hydraulic line231 connecting the master cylinder 220 to the main motor pump 210 and afirst-second hydraulic line 232 connected to the first-first hydraulicline 231 and diverging from the first-first hydraulic line 231 to guidebraking pressure to the first wheel cylinders 4.

The second hydraulic part 240 may include a second-first hydraulic line241 connecting the master cylinder 220 to the main motor pump 210 and asecond-second hydraulic line 242 connected to the second-first hydraulicline 241 and diverging from the second-first hydraulic line 241 to guidebraking pressure to the second wheel cylinders 5.

FIG. 9 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 8 according to an exemplaryembodiment. FIG. 10 is a diagram schematically illustrating a hydraulicpressure flow through the electronic hydraulic brake device of FIG. 9 ,and in which an assist accumulator is filled with high braking hydraulicpressure according to an exemplary embodiment. FIG. 11 is a diagramschematically illustrating a hydraulic pressure flow through theelectronic hydraulic brake device of FIG. 9 , and in which high brakinghydraulic pressure stored in an assist accumulator is supplied to one ormore wheel cylinders according to an exemplary embodiment.

Referring to FIG. 9 , the assist braking part 2 includes an assisthydraulic part 10, an assist accumulator 20, an assist bypass part 30,and an assist sensing part 40.

The assist hydraulic part 10 is connected to the first and secondhydraulic parts 230 and 240 to guide braking hydraulic pressure. Forexample, the assist hydraulic part 10 may be connected to thefirst-second hydraulic line 232 and the second-second hydraulic line242.

The assist accumulator 20 can be connected to the assist hydraulic part10 and filled with high braking hydraulic pressure.

The assist bypass part 30 bypasses an assist hydraulic valve 12 of theassist hydraulic part 10 to guide braking hydraulic pressure to theassist accumulator 20. For example, the assist accumulator 20 may befilled with the braking hydraulic pressure through the assist bypasspart 30, and the braking hydraulic pressure of the assist accumulator 20may be moved to the first and second hydraulic parts 230 and 240 throughthe assist hydraulic part 10.

The assist sensing part 40 measures the braking hydraulic pressure ofthe assist accumulator 20. For example, the assist sensing part 40 maybe formed in (or connected to) at least one of the assist hydraulic part10 and the assist accumulator 20 to measure braking hydraulic pressure.

In an operational state, the motor 229 and the main motor pump 210 maybe driven to fill the assist accumulator 20 with high braking hydraulicpressure at an initial stage. Then, the braking hydraulic pressuregenerated by the master cylinder 220 is supplied to the main motor pump210 through the first-first hydraulic line 231 and the second-firsthydraulic line 241, and the braking hydraulic pressure having passedthrough the main motor pump 210 is moved to the assist accumulator 20through the assist hydraulic part 10 connected to the first-secondhydraulic line 232 and the second-second hydraulic line 242. At thistime, the movement of braking hydraulic pressure from the main motorpump 210 to the master cylinder 220 is restrained, and the movement ofbraking hydraulic pressure to the first and second wheel cylinders 4 and5 is restrained (see FIG. 10 ).

When an operation error of the main braking part 1 occurs in the casethat vehicle braking is required, the high braking hydraulic pressurestored in the assist accumulator 20 is moved to the first-secondhydraulic line 232 and the second-second hydraulic line 242, and thenmoved to the first wheel cylinders 4 and the second wheel cylinders 5.At this time, the movement of braking hydraulic pressure to thefirst-first hydraulic line 231 and the second-first hydraulic line 241is restrained (see FIG. 11 ).

When the first-first hydraulic line 231 and the second-first hydraulicline 241 are opened with the vehicle braked by the assist braking part2, the braking hydraulic pressure of the wheel cylinders 3 may berelieved. When the braking hydraulic pressure is to be rapidly relievedas in vehicle posture control, the braking hydraulic pressure applied tothe wheel cylinders 3 may be adjusted through valve control of thefirst-second hydraulic line 232 and the second-second hydraulic line242.

The assist hydraulic part 10 includes an assist hydraulic line 11 and anassist hydraulic valve 12. One end of the assist hydraulic line 11 isconnected to the first and second hydraulic parts 230 and 240, and theother end of the assist hydraulic line 11 is connected to the assistaccumulator 20 via the assist hydraulic valve 12. For example, theassist hydraulic line 11 may have one end connected to the first-secondhydraulic line 232 and the second-second hydraulic line 242. The assisthydraulic valve 12 is formed on (or connected to) the assist hydraulicline 11, and opens the assist hydraulic line 11 when an operation errorof the main braking part 1 occurs.

The assist bypass part 30 includes an assist bypass line 31 and anassist bypass valve 32. The assist bypass line 31 has both endsconnected to the assist hydraulic line 11, and induces braking hydraulicpressure to bypass the assist hydraulic valve 12 and to move to theassist accumulator 20. The assist bypass valve 32 is formed on (orconnected to) the assist bypass line 31 and allows braking hydraulicpressure to move in one direction. For example, when the assistaccumulator 20 is filled with braking hydraulic pressure, the assisthydraulic valve 12 may close the assist hydraulic line 11 such that thebraking hydraulic pressure moves through the assist bypass line 31. Atthis time, a check valve capable of allowing braking fluid to move inone direction may be used as the assist bypass valve 32.

FIG. 12 is a diagram schematically illustrating an assist pump added tothe assist braking part of FIG. 9 according to an exemplary embodiment.

Referring to FIG. 12 , the assist braking part 2 according to anexemplary embodiment may further include an assist pump 50. The assistpump 50 is connected to a storage part 228, which can be connected tothe master cylinder 220 to temporarily store braking hydraulic pressure,and forcibly transfer the braking hydraulic pressure stored in thestorage part 228 to the assist accumulator 20. Since braking hydraulicpressure can be continuously supplied to the assist accumulator 20through the assist pump 50, vehicle braking can be continuouslyperformed even when an operation error of the main braking part 1, suchas a fault of the motor 229, occurs.

FIG. 13 is a diagram schematically illustrating an assist braking partconnected to the main braking part of FIG. 8 according to an exemplaryembodiment.

Referring to FIG. 13 , the assist braking part 2 includes a first assisthydraulic part 61, a second assist hydraulic part 62, an assistaccumulator 70, a first assist bypass part 81, a second assist bypasspart 82, and an assist sensing part 90.

The first assist hydraulic part 61 is connected to the first hydraulicpart 230 to guide braking hydraulic pressure, and the second assisthydraulic part 62 is connected to the second hydraulic part 240 to guidebraking hydraulic pressure. For example, the first assist hydraulic part61 may connect the first-second hydraulic line 232 to the assistaccumulator 70, and the second assist hydraulic part 62 may connect thesecond-second hydraulic line 242 to the assist accumulator 70 or thefirst assist hydraulic part 61.

The assist accumulator 70 can be connected to the first and secondassist hydraulic parts 61 and 62, and can be filled with high brakinghydraulic pressure.

The first assist bypass part 81 bypasses a first assist hydraulic valveof the first assist hydraulic part 61 to guide braking hydraulicpressure to the assist accumulator 70, and the second assist bypass part82 bypasses a second assist hydraulic valve of the second assisthydraulic part 62 to guide braking hydraulic pressure to the assistaccumulator 70. For example, the assist accumulator 70 may be filledwith braking hydraulic pressure through at least one of the first andsecond assist bypass parts 81 and 82, and the braking hydraulic pressureof the assist accumulator 70 may be moved to each of the first andsecond assist bypass parts 81 and 82.

The assist sensing part 90 measures the braking hydraulic pressure ofthe assist accumulator 70. For example, the assist sensing part 90 maybe formed in (or connected to) at least one of the first and secondassist hydraulic parts 61 and 62 or the assist accumulator 70 to measurebraking hydraulic pressure.

In an operational state, the motor 229 can be driven to fill the assistaccumulator 70 with high braking hydraulic pressure at an initial stage.Then, the braking hydraulic pressure generated by the master cylinder220 is moved to the assist accumulator 70. At this time, the movement ofthe braking hydraulic pressure from the main motor pump 210 to themaster cylinder 220 is restrained, and the movement of the brakinghydraulic pressure to the first and second wheel cylinders 4 and 5 isalso restrained.

When an operation error of the main braking part 1 occurs in a case inwhich vehicle braking is required, the high braking hydraulic pressurestored in the assist accumulator 70 is moved to the first-secondhydraulic line 232 and the second-second hydraulic line 242, and thenmoved to the first wheel cylinders 4 and the second wheel cylinders 5.At this time, the movement of braking hydraulic pressure to thefirst-first hydraulic line 231 and the second-first hydraulic line 241is restrained.

When the first-first hydraulic line 231 and the second-first hydraulicline 241 are opened with the vehicle braked by the assist braking part2, the braking hydraulic pressure of the wheel cylinders 3 may berelieved. When the braking hydraulic pressure is to be rapidly relievedas in vehicle posture control, the braking hydraulic pressure applied tothe wheel cylinders 3 may be adjusted through valve control of thefirst-second hydraulic line 232 and the second-second hydraulic line242.

More detailed structures of the first and second assist hydraulic parts61 and 62 may correspond to that of the assist hydraulic part 10 of FIG.3 , and the detailed structures of the first and second assist bypassparts 81 and 82 may correspond to that of the assist bypass part 30 ofFIG. 3 . It is also contemplated that the assist pump 50 of FIG. 12 maybe applied to the assist accumulator 70 of FIG. 13 .

In an electronic hydraulic brake device according to various exemplaryembodiments, the main braking part 1 and the assist braking part 2 canbe connected as a hydraulic pressure circuit to move braking hydraulicpressure, and high braking hydraulic pressure stored in the assistbraking part 2 can be moved to the main braking part 1 and supplied tothe wheel cylinders 3 in response to an operation error of the mainbraking part 1. Further, the assist pump 50 can be utilized to forciblymove braking fluid stored in the storage part 118 or 228 to the assistaccumulator 20. Therefore, when an operation error of the main brakingpart 1 occurs, braking hydraulic pressure can be continuously suppliedto the assist accumulator 20 to perform vehicle braking.

Although certain exemplary embodiments and implementations have beendescribed herein, other embodiments and modifications will be apparentfrom this description. Accordingly, the inventive concepts are notlimited to such embodiments, but rather to the broader scope of theaccompanying claims and various obvious modifications and equivalentarrangements as would be apparent to one of ordinary skill in the art.

What is claimed is:
 1. An electronic hydraulic brake device comprising:a main braking part configured to drive a motor to provide hydraulicpressure to a plurality of wheel cylinders; and an assist braking partconnected to the main braking part, the assist braking part beingconfigured to provide auxiliary hydraulic pressure to the plurality ofwheel cylinders in response to an operation error of the main brakingpart, wherein: the main braking part comprises: a master cylinderconfigured to generate hydraulic pressure through operation of the motorwhich is drivable in forward and backward directions according to apressurization state of a pedal; a first hydraulic part connected to themaster cylinder, the first hydraulic part being configured to guidehydraulic pressure to a first some of the plurality of wheel cylinders;a second hydraulic part connected to the master cylinder, the secondhydraulic part being configured to guide hydraulic pressure to a secondsome of the plurality of wheel cylinders; and a main motor pumpconnected to the first and second hydraulic parts, the main motor pumpbeing configured to amplify hydraulic pressure; and the assist brakingpart comprises: an assist hydraulic part connected to the first andsecond hydraulic parts, the assist hydraulic part being configured toguide hydraulic pressure; an assist accumulator connected to the assisthydraulic part and filled with the auxiliary hydraulic pressure; and anassist bypass part configured to bypass the assist hydraulic part toguide hydraulic pressure to the assist accumulator.
 2. The electronichydraulic brake device of claim 1, wherein the assist braking partfurther comprises: an assist sensing part configured to determine theauxiliary hydraulic pressure of the assist accumulator.
 3. Theelectronic hydraulic brake device of claim 2, further comprising: astorage part connected to the pedal cylinder and configured to storehydraulic pressure, wherein the assist braking part further comprises anassist pump connected to the storage part, the assist pump beingconfigured to transfer the hydraulic pressure stored in the storage partto the assist accumulator.
 4. The electronic hydraulic brake device ofclaim 1, wherein the assist accumulator is configured to receive thehydraulic pressure generated by the master cylinder so as to accumulatethe auxiliary braking hydraulic pressure.
 5. The electronic hydraulicbrake device of claim 1, wherein the assist hydraulic part comprises: anassist hydraulic line comprising a first end connected to the first andsecond hydraulic parts and a second end connected to the assistaccumulator; and an assist hydraulic valve configured to open the assisthydraulic line in response to an operation error of the main brakingpart.
 6. The electronic hydraulic brake device of claim 1, wherein theassist bypass part comprises: an assist bypass line comprising endsconnected to the assist hydraulic line, the assist bypass line beingconfigured to cause, at least in part, hydraulic pressure to bypass theassist hydraulic valve and to move to the assist accumulator; and anassist bypass valve configured to cause, at least in part, one directionof flow of the auxiliary hydraulic pressure in the assist bypass line.